Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 18-09-2021 and time 16:40:21 (Italy) in region Costa Siciliana nord occidentale (Trapani)

A magnitude ML 2.0 earthquake occured in region: Costa Siciliana nord occidentale (Trapani), on

  • 18-09-2021 14:40:21 (UTC)
  • 18-09-2021 16:40:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.2980, 12.6510 at 7 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
San Vito Lo Capo TP 16 4654 4654

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NE of Trapani (68759 inhabitants)
59 Km NE of Marsala (83194 inhabitants)
65 Km W of Palermo (674435 inhabitants)
72 Km N of Mazara del Vallo (51718 inhabitants)
79 Km W of Bagheria (55387 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 2.0 2021-09-18
14:40:21		 38.2985 12.6508 7 2022-03-30
13:04:07		 Bollettino Sismico Italiano INGV 95779081
Reviewed
Rev100 		ML 2.0 2021-09-18
14:40:21		 38.2957 12.5968 11 2021-09-18
15:07:48		 Sala Sismica INGV-Roma 95592971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 14:40:21 ± 0.4
Latitude 38.2985 ± 0.0153
Longitude 12.6508 ± 0.0183
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95779081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2002
Semi-minor axis of confidence ellipse (meter) 844
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 140
Circular confidence region, given by single value of horizontal uncertainty (meter) 2000.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.49
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.16372
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 95779081
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-01 16:59:20

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 95592971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 15:07:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSFR.HHZ. 2021-09-18T14:41:56.90 3.0 positive manual Pg 10.87 0
IV.RIBO.EHZ.01 2021-09-18T14:41:50.49 3.0 undecidable manual Pg 7.67 0
IV.ARVD.HHZ. 2021-09-18T14:41:44.89 3.0 positive manual Pn -1.92 0
IV.ATFO.HHZ. 2021-09-18T14:41:38.68 3.0 undecidable manual Pn -6.54 0
IV.SACS.HHZ. 2021-09-18T14:41:34.08 3.0 undecidable manual Pn -5.08 0
IV.ESAL.HHZ. 2021-09-18T14:41:22.45 3.0 undecidable manual Sg 2.15 0
IV.OVO.HHZ. 2021-09-18T14:41:10.88 3.0 undecidable manual Pn -1.7 0
IV.ESAL.HHZ. 2021-09-18T14:40:55.32 3.0 positive manual Pn -1.45 0
IV.HLNI.HHZ. 2021-09-18T14:40:55.96 3.0 negative manual Pn -0.5 0
IV.SCIAR.HHE. 2021-09-18T14:40:53.59 0.6 undecidable manual S 112 103.7184 50 0.99 34
IV.SOLUN.HHE. 2021-09-18T14:40:46.84 0.6 undecidable manual S 106 80.2641 50 0.52 44
IV.USI.HHZ. 2021-09-18T14:40:42.56 0.6 undecidable manual S 45 64.5909 50 0.42 46
IV.CSLB.HHE. 2021-09-18T14:40:42.43 0.3 undecidable manual P 108 129.1707 50 -0.95 50
IV.MPG.HHE. 2021-09-18T14:40:41.28 0.3 undecidable manual S 104 63.5919 50 -0.61 65
IV.SCIAR.HHE. 2021-09-18T14:40:39.93 0.3 undecidable manual P 112 103.7184 50 0.47 64
IV.LEVAN.EHE. 2021-09-18T14:40:36.52 0.3 undecidable manual S 218 43.2234 50 0.07 78
IV.MMGO.HHZ. 2021-09-18T14:40:36.38 0.3 undecidable manual P 158 76.1682 50 1.17 50
IV.MBFT.HHZ. 2021-09-18T14:40:36.88 0.3 undecidable manual S 146 47.2194 50 -0.62 67
IV.SOLUN.HHE. 2021-09-18T14:40:35.98 0.3 undecidable manual P 106 80.2641 50 0.15 71
IV.CRJA.HHZ. 2021-09-18T14:40:34.10 0.3 undecidable manual P 151 63.1923 50 0.89 58
IV.USI.HHZ. 2021-09-18T14:40:33.36 0.3 undecidable manual P 45 64.5909 50 -0.06 75
IV.MPG.HHE. 2021-09-18T14:40:32.97 0.3 undecidable manual P 104 63.5919 50 -0.31 71
IV.ERC.EHE. 2021-09-18T14:40:32.41 0.3 undecidable manual S 191 29.4483 103 0.4 74
IV.MBFT.HHZ. 2021-09-18T14:40:29.94 0.3 undecidable manual P 146 47.2194 50 -0.8 62
IV.LEVAN.EHE. 2021-09-18T14:40:29.84 0.3 undecidable manual P 218 43.2234 50 -0.3 74
IV.ERC.EHE. 2021-09-18T14:40:27.22 0.1 undecidable manual P 191 29.4483 103 -0.35 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MBFT.HHN. ML:2.0 0.00028217769999999996 0.3392 AML other m 2021-09-18T14:40:38.21
IV.MBFT.HHE. ML:1.9 0.00021876825 1.6416 AML other m 2021-09-18T14:40:39.95
IV.USI.HHE. ML:2.5 0.0006245000000000001 1.66 AML other m 2021-09-18T14:40:45.98
IV.CRJA.HHE. ML:2.2 0.000314 0.76 AML other m 2021-09-18T14:40:46.43
IV.USI.HHN. ML:3.0 0.0020571310000000002 0.48 AML other m 2021-09-18T14:40:46.36
IV.CRJA.HHN. ML:2.1 0.0002535 0.46 AML other m 2021-09-18T14:40:48.52
IV.MMGO.HHN. ML:1.8 0.0000862 0.5 AML other m 2021-09-18T14:40:50.23
IV.MMGO.HNN. ML:1.8 0.00009388152 0.5184 AML other m 2021-09-18T14:40:50.23
IV.MMGO.HNE. ML:1.8 0.00008296336500000002 0.4992 AML other m 2021-09-18T14:40:53.39
IV.MMGO.HHE. ML:1.8 0.00008945 0.44 AML other m 2021-09-18T14:40:53.61
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download